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<title>FatFs - f_printf</title>
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<div class="para">
<h2>f_printf</h2>
<p>The f_printf function writes formatted string to the file.</p>
<pre>
int f_printf (
  FIL* <em>FileObject</em>,     /* File object */
  const char* <em>Foramt</em>,  /* Format stirng */
  ...
);
</pre>
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<div class="para">
<h4>Parameters</h4>
<dl class="par">
<dt>FileObject</dt>
<dd>Pointer to the open file object structure.</dd>
<dt>Format</dt>
<dd>Pointer to the null-terminated format string.</dd>
<dt>...</dt>
<dd>Optional arguments.</dd>

</dl>
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<div class="para">
<h4>Return Values</h4>
<p>When the function succeeded, number of characters written is returned. When the function failed due to disk full or any error, an <tt>EOF</tt> will be returned.</p>
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<h4>Description</h4>
<p>The f_printf() is a wrapper function of <a href="putc.html">f_putc()</a> and <a href="puts.html">f_puts()</a>. The format control directive is a sub-set of standard library. It supports <tt>c s d u X</tt> for the data type, <tt>l</tt> for the precision and <tt>0</tt> for the flags.</p>
<p>This function is available when read-write configuration and <tt>_USE_STRFUNC</tt> is 1 or 2.</p>
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<div class="para">
<h4>Example</h4>
<pre>
    f_printf(&amp;fil, "%6d", -200);         // "  -200"
    f_printf(&amp;fil, "%02u", 5);           // "05"
    f_printf(&amp;fil, "%ld", 12345678L);    // "12345678"
    f_printf(&amp;fil, "%08lX", 1194684UL);  // "00123ABC"
    f_printf(&amp;fil, "%s", "String");      // "String"
    f_printf(&amp;fil, "%c", 'a');           // "a"
</pre>
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<h4>References</h4>
<p><tt><a href="open.html">f_open</a>, <a href="putc.html">f_putc</a>, <a href="puts.html">f_puts</a>, <a href="gets.html">f_gets</a>, <a href="close.html">f_close</a>, <a href="sfile.html">FIL</a></tt></p>
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